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CVE-2026-25891— Fiber has an Arbitrary File Read in Static Middleware on Windows

Quick assessment

Affected
gofiber fiber
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fiber是Fiber开源的一款使用Go语言编写的开源Web框架。 Fiber v3 3.0.0及之前版本存在路径遍历漏洞，该漏洞源于静态中间件清理器可被绕过，可能导致在Windows服务器文件系统上读取任意文件。

AI Predicted 7.5 Difficulty: Easy EPSS 0.69% · P51
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I. Basic Information for CVE-2026-25891

Vulnerability Information
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Vulnerability Title
Fiber has an Arbitrary File Read in Static Middleware on Windows
Source: CVE Program / CVE List V5
Vulnerability Description
Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fiber 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fiber是Fiber开源的一款使用Go语言编写的开源Web框架。 Fiber v3 3.0.0及之前版本存在路径遍历漏洞，该漏洞源于静态中间件清理器可被绕过，可能导致在Windows服务器文件系统上读取任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gofiber fiber >= 3.0.0, < 3.1.0 -

II. Public POCs for CVE-2026-25891

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III. Intelligence Information for CVE-2026-25891

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Patches & Fixes for CVE-2026-25891 (1)

Vendor Advisories for CVE-2026-25891 (1)

Same Patch Batch · gofiber · 2026-02-24 · 3 CVEs total

CVE-2026-25899 7.5 HIGH Fiber is Vulnerable to Denial of Service via Flash Cookie Unbounded Allocation
CVE-2026-25882 Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

IV. Related Vulnerabilities

Same product: fiber
Same vendor: gofiber
Same weakness: CWE-22

V. Comments for CVE-2026-25891

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